Sponge holder



FIG. 1 is a perspective view of the sponge holder showing the new design;

FIG. 2 is a front elevational view thereof; the back elevational view is identical;

FIG. 3 is a top planview thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a left side elevational view thereof; the right side elevational view is identical. 

The ornamental design for a sponge holder, as shown and described. 